Brake-operating mechanism.



No. 765,160. PATENTED JULY 19, 1904. I. BAKER. BRAKE OPERATING MECHANISM.

APPLIGATION FILED JAN.14. 1904. N0 MODEL.

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I. BAKER. BRAKE OPERATING MEGHANISM.

APPLIGATIDN FILED 11111114, 1904.

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9 lllllllIl/II A UNITED STATES Patented July 19, 1904.

IRVIN BAKER, OF LATTY, OHIO.

BRAKE-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 765,160, dated July 19, 1904.

Application filed January 14, 1904. Serial No. 189,019. (No model.)

To It whom it may concern:

Be it known that I, IRVIN BAKER, a citizen of the United States, residing at Latty, in the county of Paulding and State of Ohio, have invented a new and useful Brake-Operating Mechanism, of which the following is a specification.

My invention relates to car-brakes of the type known as track-brakes, and has for its objects to produce a comparatively simple inexpensive device of this character in which the track-gripping members will in practice be normally maintained in a position at the sides of the rails for instant action thereon and be automatically elevated to override frogs or other track obstructions at'switches or crossings and one in which the trackbrakes when brought into action will serve to operate the wheel-brake.

To these ends the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a side elevation illustrating my improved device applied for use. Fig. 2is a detail plan view. Fig. 3 is a detail end elevation, partly in section. Fig. 7 is a detail sectional elevation illustrating the connection between the two cylinders. Fig. 8 is an enlarged horizontal section longitudinally through the secondary cylinder and adjacent mechanism. Figs. 9 and 10 are detail views of the valve.

Referring to the drawings, 1 designates the truck-bolster, to the end of which is bolted the usual bolster frame carrying journalboxes in which are journaled the ends of axles 2 of the transporting-wheels 3, designed to travel upon the main rails 4, the bolster being composed of a pair of bars or members 5, maintained in vertical spaced relation by suitable spacing-blocks. These parts may all be of the usual or any preferred construction or material, inasmuch as they constitute no part of the present invention.

In accordance with my invention I suspend from the bolster 1 by links 6 a brakebeam 7, disposed above and parallel with the rail 4 between the wheels 3, said beam being provided at its ends with brake shoes or heads Figs. 4, 5, and 6 are detail views.

9, the outer faces of which are in close relation with and curved to conform to the treads of the Wheels, while the inner faces of the heads, which project laterally of the brakebeam, are provided with vertical upwardlyopening grooves or recesses 10.

Pivoted upon the lower member 5 of the bolster is a rock-shaft 11, provided with a pair of normally upwardly and outwardly inclined crankarms 12 and with a downwardly-extended actuating arm or lever 13,

the rock-shaft being maintained in normal position by a torsion spring 14. Each of the crank-arms has a horizontally-extending finger' or pintle 15, on which is pivotally mounted a pair of links 16, which are in turn pivotally connected at their lower ends with the vertically-uprising arms 17 of gripping members 18, lying, respectively, on opposite sides of the brake-beam between the heads 9 and having guide members or trunnions 19 working in the guide ways or grooves 10. It may here be said that the inner faces of the gripping members are shaped to conform to the side faces of the rails and that when the shaft 5 is rocked in the proper direction against the action of spring 14 the members will through the medium of the links 16 be moved downward and inward for engagement with the sides of the rail to firmly grip the latter between them. As the members grip the rail they will, owing to contact with the laterally-extending heads 9, throw the outer faces of the latter into contact with the treads of the rear wheels, thus obtaining a combined track and wheel engaging action.

20 designates a rocking member or bellcrank pivoted upon an angle-bolt or other support 21, carried by the bolster 1, and connected by a link or analogous element 22 with the rod of a piston 23, movable in a primary cylinder 24, carried beneath the car. The member 20, which is moved to and maintained in normal position by a spring 25, carries a pivoted actuating member or lever 26, pro-- vided at its lower end with a rotary antifriction-roller 27 and adapted when the member 20 is rocked against the action of the spring, as hereinafter explained, to be moved bodily downward into the path of a supplemental arm 30, depending vertically from the horizontal stem 31 of a disk valve 32, disposed for rotation in a valve-casing 33, provided upon the side of a secondary cylinder 34, in which works a piston 35, forced normally outward by a spring 36, said cylinder being in communication with the valve-chamber at a point in advance of the piston through an opening or port 37, while said chamber is adapted for communication with the external air through an exhaust opening or port 38, the valve 32, which is pressed to its seat by a spring 39, being provided with an opening 40, normally in register with the port 37, and upon its inner face with a concentric groove or channel 41, overriding the exhaust-port 38 and terminating at its ends adjacent to the openings 40. The rod of piston 35 is connected by a cable or other flexible element passing around the guide-pulley 42 with the lower end of the actuating arm or lever 13, whereby upon the inward stroke of the piston the shaft 11 will be rocked for lowering the gripping members 18 in the manner and for the purpose heretofore explained.

43 indicates a pair of leaf-springs attached to and depending vertically from the bottom of the car and receiving between them a lateral finger or extension 44, projecting outward from the lower end of arm 30 to hold the valve in normal position, with its opening or port 40 in register with the port 37 while 45 is a pipe or duct through which air or steam, which is delivered under pressure through a pipe or duct 46 to the primary cylinder, may pass to the valve-chamber 33 and thence to the secondary cylinder for acting upon the piston therein.

In practice air or steam under pressure and under control of the engineer flows from the engine or other suitable source through the pipe 46 to the primary cylinder, causing an outstroke of the piston 23,and thereby,th rough the medium of element 22, rocking the member 20 to lower the lever 26 into the path of the abutment 28, in which position it will be normally maintained during the transportation of the car. As the piston 23 moves outward it opens a side port in the cylinder 24 and permits the fluid under pressure to pass through pipe 45, valve-chamber 33, and ports 40 37 into the cylinder 34, where it will act to move the piston 35 inward against the spring 36 and through the medium of the cable actuate the lever 13 for lowering the members 18 to position at the sides of the rail, but not into engagement with the latter. The

parts will remain in this position until it is desired to apply the brake, when an increased flow of fluid is permitted, thus causing a full stroke of the piston 35 sufficient to move the gripping members to gripping position. If,

on the other hand, the train approaches a.

switch or crossing, the actuating-lever 26 will come in contact with the abutment 28 and through the medium of link 29 and arm 30 rotate the valve 32 for moving the opening 40 out of register with opening 37 thereby cutting off the supply of fluid to the cylinder 34.and at the same time bringing one end of the groove or channel 41 over the latter opening, thus permitting the air in the cylinder to escape or exhaust through opening 37 channel 41, and port 38. The spring 36 then moves the piston forward and permits the gripping members to rise for overriding track obstructions, in which position the members will remain until the actuating-lever 26 has passed the abutment, when the parts will again return to normal position.

From the foregoing it will be seen that I produce a simple inexpensive device which in practice will admirably perform its functions. In attaining these ends it is to be understood that I do not limit myself to the precise details herein set forth, inasmuch as minor changes may be made without departing from the spirit or scope of the invention.

Having thus described my invention, what I claim is 1. In a track-brake, the combination with a rock-shaft provided with crank-arms, of a pair of gripping members suspended from the latter, means acting on the shaft to maintain the members in a position at the sides of but in non-engagement with the rails, means for automatically releasing the shaft, and means for automatically raising the members to override obstructions when the shaft is released.

2. In a track-brake, the combination with a rock-shaft provided with crank-arms, of a pair of gripping members suspended from the latter, means acting on the shaft to maintain the members in a position at the sides of but in non-engagement with a rail, means for automa'ticall y releasing the shaft, and a spring acting on the shaft to actuate the latter when so released for raising the members to override track obstructions.

3. In a track-brake, the combination with a rock-shaft provided with crank-arms, of a pair of gripping members suspended from the latter, a piston operatively connected with the shaft and operable for maintaining the members in a position at the sides of but in nonengagement with the rails, means for automatieall y operating the piston to free the shaft and permit the members to rise, and means for raising the members to override track obstructions when freed.

4. In a track-brake, the combination with a rock-shaft provided with crank-arms, of a pair of gripping members suspended from the latter a piston operatively connected with .the shaft and operable for moving the latter in one direction to lower the members, means for automatically operating the piston to free the shaft and permit the members to rise, and a spring acting on the shaft to raise the members.

5. In a track-brake, the combination with a rock-shaft provided with crank-arms, of a pair of gripping members suspended from the latter, a piston operatively connected with the shaft and operable for moving the latter in one direction to lower the members, an abutment disposed adjacent to the rails, an actuating member operable thereby, mechanism controlled by the actuating member for automatically operating the piston to free the shaft and permit the gripping members to rise, and

means for raising the latter.

6. In a track-brake, the combination with a rock-shaft provided with crank-arms, of links pivotally mounted on the crank-arms, a pair of brake members pivotally connected with the links, means, comprising an arm or lever, flexible connection and piston, for operating the rock-shaft to move the members to braking position, and a spring for automatically returning the rock-shaft to normal position.

7. In a track-brake, the combination with a bolster, of a bar suspended therefrom and provided with brake-heads, a rock shaft provided with crank-arms, links pivotally mounted on the crank-arms, a pair of gripping members pivotally connected. with the links, said members being disposed to engage the brakeheads, means for operating the rock-shaft to 9. In a track-brake, the combination with a bolster, of a bar suspended therefrom and provided with laterally-extending brake-heads having guideways, a rock-shaft provided with crank-arms, a pair of brake members pivotally connected with the latter, guides provided on the members and traveling in the guideways, means, comprising an arm or lever, flexible connection and piston, for operating the shaft to move the members to braking position, and means for automatically returning the shaft to normal position.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two Witnesses.

IRVIN BAKER.

Witnesses:

ARTHUR L. KNAPP, JOHN S. GIsH. 

